birch



(Np Model.) I 3 Sheets-Sheet 1.

W. BIRCH. APPARATUS FOR FILTERING SEWAGE 0R IMPURE LIQUIDfi.

No. 582.518.v

Patented May 11, 1897.

' WiTN ES'SES 3 Sheets-$heet 2.

(No Model.)

W. BIRCH. APPARATUS FOR PILTERING SEWAGE 0R IMPURE LIQUIDS.

No. 582,518. Patented May 11, 1897.

?1' S'a'Q mvtmoa 60% W WWW-m WITNESSES:

ATTORNEY r a s venzns w. PHQTO-LITHO, msmuumu u z;

(No Model.)

A 3 Sheets-Sheet 3. W; BIRCH.

APPARATUS FOR PILTERING SEWAGE- 0R IMPURB LIQUIDS. No. 582,518.

F r E 151/512 0' PVZ'Z9Z555E5. w fw: ow/ w.

Patented May 11, 1897.

UNITED STATES PATENT FFICE.

WILLIAM BIRCH, OF MANCHESTER, ENGLAND.

APPARATUS FOR FILTERING SEWAGE OR IMPURE LIQUIDS.

SPECIFICATION forming part of Letters Patent No. 582,518, dated May 11,1897.

Application filed May 19, 1896. Serial No. 592,219. (No model.)

To all whom, it may concern.-

Be it known that 1, WILLIAM BIRCH, a subject of the Queen of GreatBritain, residing at Lower Broughton, Manchester, in the county ofLancaster, England, have invented Improved Apparatus for FilteringSewage or Impure Liquids, of which the following is a specification.

This invention relates to improvements upon the apparatus for whichLetters Patent No. 461,232 were granted to me October 13, 1891, formachines in which an endless felted filtering cloth or fabric is used asthe filtering agent dipping intoa trough or vessel and passing over asuitably-formed gridded or false bottom, the said filtering-cloth beingcleansed by the intermittent rush'of a roller over its surface.

My invention will be readily understood from the following descriptionon reference to the accompanying drawings.

Figure l is a side elevation of my improved filtering apparatus, drawnpartly in section. Figs. 2 and 3 are detached views hereinafter moreparticularly referred to. Fig. 4 is a cross-section, and Fig. 5 a plan,of a portion of one form of the filtering-band. Fig. 6 is a View similarto Fig. 2, but showing the parts in a different position. Fig. '7 is aside elevation of Fig. 6. Fig. 8 shows a section and a plan of a portionof another form of filtering-band.

a is the trough to contain the water to be filtered, the bottom of thesaid trough being composed of a series of rollers a, carried by sidepieces or beams a as seen on the detached transverse section, Fig. 3,and forming a concave surface, as seen at Fig. 1.

b is the filtering-cloth,,passing in the direction indicated around adrum 0, which is capable of turning freely on its axle.

According to my invention, instead of using felt, as usual, for thefiltering-cloth b, I make this filtering-cloth of a strong cotton-wovenfabric with a pile I) raised upon one side thereof, as shown in Figs. 4and 8, and at intervals I throw in a weft Z) of crimped or other wireacross the same to keep it to its proper width and flat, as shown inFig. 8. Instead of these wires I sometimes fix across the cloth narrowsteel plates 1), Figs. 4 and 5, for the same purpose, and the ends ofthese Wires or plates working between two fixed guide-plates 4r, Figs. 1and 3, will keep the filtering-cloth in a central position and preventit from diverging in a lateral direction. The teeth 1) of the plates 1)are passed through the cloth and clenched on the face thereof, as shownin Fig. 4:.

cl is the small cleaning-roller, carried by a lever e, which is mountedon the axis of the drum 0. This lever e is raised by the cam c, Fig. 1,acting on an antifriction-roller e on the slotted link 6 and is pulleddownwhen released by the cam e by the weight 6 fixed by a cord 6 orotherwise to the quadrant e. The spring 6 receives through the straps ethe shock of the fall of the Weight e I mount the roller cl upon a smalllink cl, pivoted at e to the lever c. This link cl is made with a fingeror projection d, (see Fig. 2,) against which a'spring d fixed to thelever 6, acts and presses the roller cl hard against the surface of thecloth b, holding the link d at an angle to the lever e, as indicated inFig.

6 and by the dotted positions in Fig. 2; but when the end of the levere, which carries the link d, has been raised by the cam e and link 2 tothe position shown by the full lines on Fig. 2 the link cl is drawn downbya curved arm d loosely connected to the link d at one end, the otherend passing through an eye d fixed to the frame. This arm d is so formedthat as the end of the lever e, carrying the link 01', rises the arm (1is pressed upon by the boss e of the lever e or by a similar projection,and the other end of the arm 01 bears hard against the bottom of the eyeor slotted bracket (1 The boss or projection e acting as a fulcrum,causes the arm d to become a lever, and the end at (1 being stationarythe other end will draw down the link 61, overcoming the action of thespring (1 This turns the link (1 parallel with the arm 6, and thusremoves the roller d from the cloth I), so that water issuing from aspirt-pipe Q will run down the surface of the cloth and moisten the sameready for the downward rush of the roller 01 when released by the cam e.I arrange a second spirt-pipe g at the other side of the drum 0, whichsupplies water to the other surface of the cloth b, and as it passesaround the drum 0 this Water is pressed through the cloth and helps toloosen the dirt or deposit on the surface presented to the action of theroller d. To facilitate this action, I cover the drum 0 with a coatingof thick felt or other resilient and absorbent material which willretain a considerable quantity of water and allow the roller cl to forcethe same out through the filtering material each time that it descends.

The pipes g and g are supplied continuously by the piping g from a pumpg which is worked by a lever g and a revolving disk 9 carrying threecrank-pins, this lever being weighted by weight 9 As shown, the lever ispivoted to the axis of the upper drum, but other means could be used forholding it against the cam. Thus both surfaces of the fabric 1) aresupplied continuously with water close to the point where the saidfabric is to be cleaned by the roller (Z, and the impurities are thusloosened from the said fabric and more easily removed by the saidroller.

The space between the ends of the rollers a and the side pieces (t iscovered as nearly as possible by long strips or laths a (see Fig. 3) ofwood or metal, upon which the edges of the fabric 1) rest, and the saidedges are held down to follow the curved form (seen at Fig. 1) of theside pieces a and strips a by the weightof strips a of lead or othersuitable material, connected together by cross-bars a at suitableintervals.

I claim as my invention 1. An endless filtering cloth or fabric of wovencotton having a raised pile surface and occasional cross wires orplates, substantially as and for the purposes set forth.

2. In an apparatus for filtering impure liquids, the combination of anendless filtering cloth or fabric of woven cotton having a raised pilesurface and occasional cross wires or plates with guides against whichthe wires or plates act, all substantially as and for the purposes setforth.

3. In a filtering apparatus, the combination of an endlessfiltering-cloth, and a cleansing-roller, with a drum around which thecloth passes and over which the cleansingroller works, the said drumhaving a covering of thick felt or other absorbent and resilientmaterial, alternately taking up and parting with cleansing water orfluid, and a spurtpipe to supply the fluid, all substantially as and forthe purposes set forth.

4. In filtering apparatus, the combination of an endlessfiltering-cloth, a cleansing-roller and a drum around which the clothpasses and over which the cleansing-roller works, with a cam-shaft,water-pipes and a pump actuated by the cam-shaft for giving a continuoussupply of water to both sides of the filtering-cloth, substantially asset forth.

5. The combination of an endless filteringcloth, with a drum aroundwhich the cloth passes and over which a cleansingroller works, a leverprovided at one end with a link carrying the cleansing-roller, a springacting on the link for holding the cleansingrollerto the surface of thecloth,a cam-shaped arm carried by the link and passing through a fixedeye, and a projection on the lever aforesaid to bear 011 the said armwhen the cleansing-roller has been raised to remove the roller from thesurface of the cloth, substantially as and for the purpose set forth.

6. In a filtering apparatus, the combination of an endlessfiltering-cloth,and a trough, the bottom of the trough being composed ofa series of rollers, with strips a, strips a, and cross-bars aconnecting the strips a, substantially as an d for the purposes setforth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

VILLIAM BIRCH.

Vitnesses CHARLES A. DAVIES, .INo. HUGHES.

